Bathtub grab bar



FIG. 1 is a front elevational view of the bathtub grab bar, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof, the other side being identical;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front and side perspective view thereof. 

The ornamental design for a bathtub grab bar, as shown and described. 